🤰 受孕日期计算器Conception Date Calculator
根据预产期、末次月经第一天或超声推算的孕周，估算受孕日期和可能的受孕时间窗口，并给出对应的排卵日。Estimate when conception most likely happened from the due date, the first day of the last period or an ultrasound dating, with the likely conception window and ovulation date.
使用说明与常见问题How-to & FAQ
「受孕日期计算器」是什么？What is the Conception Date Calculator tool?
根据预产期、末次月经第一天或超声推算的孕周，估算受孕日期和可能的受孕时间窗口，并给出对应的排卵日。Estimate when conception most likely happened from the due date, the first day of the last period or an ultrasound dating, with the likely conception window and ovulation date.
如何使用「受孕日期计算器」？How do I use the Conception Date Calculator tool?
在「受孕日期计算器」中，填写「依据」、「日期」、「月经周期（天，末次月经法）」、「超声时孕周：周」、「超声时孕周：天」等参数，结果会随输入实时计算并显示在下方。In the Conception Date Calculator: Fill in "Based on", "Date", "Cycle length (days, last-period method)", "Ultrasound age: weeks", "Ultrasound age: days"; results are recalculated instantly as you type.
怎么由预产期推算受孕日？How is conception worked out from the due date?
按 28 天周期，预产期为末次月经后 280 天，受孕（排卵）约在末次月经后 14 天，因此受孕日 ≈ 预产期 − 266 天（38 周），排卵日按受孕日给出。用末次月经法且周期不是 28 天时，工具把排卵日放在下次月经前 14 天，预产期也随周期调整（周期每长 1 天推后 1 天），结果里会注明。With a 28-day cycle the due date is 280 days after the last period and conception (ovulation) is about 14 days after it, so conception ≈ due date − 266 days (38 weeks); the ovulation date shown equals the conception date. In last-period mode with a cycle other than 28 days, ovulation is placed 14 days before the next period and the due date shifts with the cycle (one day later for each extra day); the result says so.
为什么给出一个窗口？Why a window?
精子可在体内存活约 5 天，卵子约 1 天，所以可能受孕的性行为发生在排卵前 5 天到排卵后 1 天。实际排卵日也因人而异，超声推算通常最准确。Sperm can survive about five days and the egg about one, so the intercourse that led to pregnancy falls from five days before to one day after ovulation. Ovulation timing varies, and early ultrasound dating is usually the most accurate.
能用来确定生父吗？Can this establish paternity?
不能。估算误差可达数天甚至一周以上，确定亲子关系需要 DNA 检测。No. The estimate can be off by days or more than a week; paternity needs a DNA test.
结果可以代替医生的建议吗？Can this replace medical advice?
不能。「受孕日期计算器」基于常用公式给出估算，个体差异较大，如有健康问题请咨询医生或专业人士。No. The Conception Date Calculator gives estimates from common formulas; individuals differ, so consult a doctor or professional for health decisions.
「受孕日期计算器」免费吗？需要注册吗？Is the Conception Date Calculator free? Do I need an account?
「受孕日期计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Conception Date Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.